Improvement in stone pavement



llzltird *glatte patent (amine.

CHARLES Gr. WATERBURY, OF NEW YORK, N.'Y.

Leners Patent No. 102,629, dated Maja, 1870.

IMPRovnMnNrIN erom: PAvnMnNT.

vThe Schedule referred to in' these Leiters Patentvand making part of the came To all whom it Imay concern:

Be it known that I, CHARLES G. WATERBURY, of the city of New York,'iu.the county of New York and State of New York, haver invented a new and useful Improvement in Stone' Pavements; and I do hereby declare that the following is a full, clear, and

yexact description thereof, reference being had to the accompanying drawing and to the letters of reference v marked thereon.

The accompanying drawing represents a section of pavemeutmade pursuant to my invention, with the foundation on which it is laid.

.The earth of a roadway upon which my improved vstone pavement is to .be laid must first be suitably graded and rolled, or treated in any of the usual methods, in order to prepare it for the reception of the pavement. It is then brought to such crown as may be desired and made smooth. I then cover the surface ofthe roadway or be'd with a'looring of com- .u'ion boards or plank, laid lengthwise with the line of the street or roadway, which flooring may also be .covered with tar on one or bot-h sides, or treated in any known manuel' to prevent rot or decay.

A', in the drawing, represents the flooring, thel ends resting on transverse sleepers, a, which sleepers may consists of strips of plank similar to those used in the flooring.

I place upon this flooring foundation about an inchof clean, sharp sand, or a mixture of tar and gravel, for the purpose vof bedding the stone blocks, so that .they may be brought to a uniform height, and form a proper surface for the pavement.

rIhe stone blocks B `areplaeed on their edges upon said foundation, and so imbedded in the sand asto present an even surface on top.

When-the stone -blocks are dressed on all. sides to a regular form, say about three inches 'in thickness, about fve or six inches in depth, and from tive to fteen inches in length, they are set in rows across the street or roadway, and narrow spaces are left between the rows to be filled with tar and gravel, or some other suitable cement. But, when not so dressed, the ir-4 regularities of form will be such that, when'set as-close together aspracticable,-there will be sucientinterstices between them to receive the cement. It' the stone blocks'are quite irregular as to their height or depth, a deeper bedot sand will be required tolbring them to an even upper surface.

When the stone pavement is thus laid down,fI illthe crvices or interstices between the'stone blocks with sharp gravel, snciently warm not to chill the tar subsequently to be applied. Then warm mineral or vegetable tar is Y,to be poured over the gravel, so that it will penetratethe crevices and fill all the open spacesin the gravel between the stone blocks, ceinentingl the gravel and. the stone blocks together, and causing the mass of stone and gravel to adhere Iirmly togetherl.

Instead ofthe warm gravel and tar any other snit;

able cementing material maybe employedLsuoh as' grouting with cement. coal-tar or pitch. The coal-tar, rn all cases, is to be boiled down and so thickened with pitch as to Abe tough and brous, and not brittle, even in cold weather. As rapidly as the same is completed the whole surface of the pavement is to be, covered with sand or line gravel, about three-fourths of an inch thick.

I have found by experience that vin a stone pave-l ment, laid as above described, on a board foundation, stone of about one-half the depth of those found necesysary in a payement Vlaid on an earth foundation iu the usual way will keep even ou the surface, and make having the interstices between the stone blocks filledwith gravel aud tar, -or other suitable cement, substantially as described.

G. G. WATERBURY.

Witnesses:

J. J. Goonrs, J os. L. GooMBs.

I prefer, -however, common 

